Im having the same problem:"LoadAds.php is missing/corrupt from your sources directory. Please make sure that it uploaded properly. The Ad mod won't be able to function properly. If you are having issues, please visit www.smfads.com!"

The thing is, the loadads.php is where it should be, and when i compared it to a freshly downloaded file from the instalation RAR, it is the same! There is no problem with the file on my server...